《Linux 程序设计入门》 第四版 §6.6 子窗口

oychw

§6.6  子窗口
       子窗口的创建和删除：
#include
WINDOW *subwin(WINDOW *parent, int num_of_lines, int
num_of_cols,
int start_y, int start_x);
int delwin(WINDOW
*window_to_delete);

         子窗口和新窗口的区别：子窗口不存储屏幕字符集，而是共享父窗口的，所以子窗口实际上改变了父窗口的屏幕，子窗口清除后，屏幕依旧没有变化。
         子窗口一般用于滚动。
         刷新屏幕前，父窗口必须调用touchwin。

实例：
# cat subscl.c
/*
First, the initial code section. The base window display is initialized
with some text.  */

#include
#include
#include

int main()
{
   
WINDOW *sub_window_ptr;
   
int x_loop;
   
int y_loop;
   
int counter;
   
char a_letter = '1';

   
initscr();

   
for (y_loop = 0; y_loop
      
for (x_loop = 0; x_loop
           
mvwaddch(stdscr, y_loop, x_loop, a_letter);
           
a_letter++;
           
if (a_letter > '9') a_letter = '1';
      
}
    }


/*
We now create the new scrolling subwindow
   
and, as advised, we must 'touch' the parent window before refreshing the
screen.  */

   
sub_window_ptr = subwin(stdscr, 10, 20, 10, 10);
   
scrollok(sub_window_ptr, 1);

   
touchwin(stdscr);
   
refresh();
   
sleep(1);

/*
Then we erase the contents of the subwindow, print text to it and
refresh it.
   
The scrolling text is achieved by a loop.  */

   
werase(sub_window_ptr);
   
mvwprintw(sub_window_ptr, 2, 0, "%s", "This window will
now scroll");
   
wrefresh(sub_window_ptr);
   
sleep(1);

   
for (counter = 1; counter
      
wprintw(sub_window_ptr, "%s", "This text is both wrapping
and \
                    scrolling.");
      
wrefresh(sub_window_ptr);
      
sleep(1);
    }

/*
Having finished this loop, we delete the subwindow. Then we refresh the
base screen.  */

   
delwin(sub_window_ptr);

   
touchwin(stdscr);
   
refresh();
   
sleep(1);

   
endwin();
   
exit(EXIT_SUCCESS);
}


               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/21908/showart_1721298.html